Easy. Refreshing. Inspired by Macaroni Grill's lime-flavored Limonata Nojito, which is made of San Pellegrino Limonata, agave nectar, lime, and mint. Ate there last night w/ Blake. Basically tastes like a minty lemon soda. It'd also taste great with lime juice, but I had to use some lemons and didn't have any limes.
1-2 cups cold water
1/2 - 3/4 cups granulated sugar
1 liter tonic water
mint leaves (some chopped, some whole)
* Note: I didn't measure, so these are estimates. You might prefer more or less of something.
(1) Juice 3-5 lemons and pour into pitcher
(2) Add water
(3) Add sugar
(4) Add tonic water
(5) Add mint leaves
(6) Add ice
(7) Mix well
Pretty simple, right? You could also make a simple syrup (Boil 1 part water : 1 part sugar and cool it).